Dynamo-electric machine.



H. H. RALSTON.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED MAY 31, 1907.

1,030,01 3, Patented June 18,1912.

Momma wmmw Wmwwa Cir UNITED STATES A'IENI.

I-IOVV'ARD I-I. B ALSTON, OF NORIVOOD, OHIO, ASSIGNOR TOALLIS-GI-IALMERS GOIYIEANY,

A CORPORATION OF NEW JERSEY, OOBSEPANY, A CORPORATION OF OHIO.

AND THE BULLOCK ELECTRIC MANUFACTURING DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Application filed May 31, 1907.

Patented June 18, 1812. Serial No. 376,479.

To all whom it may concern:

Be it known that I, Ilowann H. RALSTON, citizen of the United States,residing at Yorwood, in the county of Hamilton and State of Ohio, haveinvented certain new and useful Improvements in Dynamo-ElectricMachines, of which the following is a full, clear, and exactspecification.

My invention relates to means for fasten ing the commutator necks to thecommutator bars of dynamo-electric machines.

In the construction of commutators for dynamo-electric machines, thecommutator necks or leads have generally been fastened to theirrespective commutator bars by soldering, riveting, or both before thecommutator is assembled. This method of procedure, however, is sometimesnot feasible in large machines, for it is sometimes necessary to ship acommutator with the commutator necks or leads unattached. In such casesit is necessary that some means be provided for readily attaching thecommutator necks to the commutator segments after the commutator isassembled.

It is the object of my present invention to provide such means.

My invention therefore comprises certain novel features which will beapparent from the description and drawings and will be particularlypointed out in the claims.

Figure 1 shows a commutator segment with a fragment of a commutator neckattached thereto; Fig. 2 is an end view of the arrangement shown in Fig.1; Figs. 3 and I show two intermediate posit-ions through which thecommutator neck passes as it is being attached to the commutatorsegment; Fig. 5 is a partial end view of the assembled commutator; andFig. 6 is an isometric View of the locking key.

The armature end of each of the commutator segments 10 is slotted at 11,and two pins 12 extending across said slot are put in place. Thecommutator necks or leads 18 are fornnd with notches let, notch 15, andslot 16 as shown.

After the commutator is assembled, the commutator bars or segments beingsupported in any desired or usual manner, the commutator necks may beattached at any time. Each of said necks is inserted from above into theslot 11 of one of the commutator segments, as shown in Fig. 3, and

is forced first down ard and then toward the armature end of thecommutator into the position shown in F 4, with the notches l4 fittingover the pins 12. A key 17 of approximately tie same thickness astheslot 11 is then forced into said slot between the neck 13 and thesolid part of the commutator section 10, as shown in Fig. This key holdsthe neck 13 firmly against the pins 12. ll hcn the key 17 reaches theposition shown in Fig. 4, a leaf spring 18 fixed in a saw kerf thereinsprings out into engagement with the notch 15. as shown in Fig. 1, toprevent the key from being moved outwardly from any cause whatsoever. Toimprove the electrical connection between the commutator segment 10 andthe neck 13, solder may be run into the slot 16 in said neck, spreadingthence to the engaging surfaces of the neck and the segment.

Many modifications may be made in the precise arrangement here shown andde scribed, and all such which come within the spirit and scope of myinvention I aim to cover in the following claims.

hat I claim as new is 1. In combination, a commutator bar slotted at oneend, a commutator neck fitting into said slot, and means also fittinginto said slot and arranged to engage said neck and a wall of said slotto lock the neck in place in the slot, said means in cluding a resilientportion adapted to prevent the withdrawal of said means when onceinplace.

2. In combination, a slotted commutator bar, a commutator neck adaptedto be inserted in the slot in said bar, and a resilient member forlocking said neck in place and being adapted to fit in said slot betweena wall of said slot and said neck.

3. In combination, a slotted commutator bar, a commutator neck adaptedto be inserted in the slot in said bar, a member for locking said neckin place, said member including a latch for preventing said lockingmember from being withdrawn after it is once in looking position.

t. In combination, a commutator bar slotted at one end, a pin extendingtransversely across said slot, a commutator neck provided with a notcharranged to fitover said pin, .and a locking member for holding saidneck against said pin.

- against said pins,

5. In combination, a commutator bar slotted at one end, pins extendingtransversely across said slot, a commutator neck providedwith notchesarranged to fit over said pins, a key for holding said neck and meansfor preventing the withdrawal of said key when once in place.

6. In a commutator, a plurality of commutator bars, a plurality ofcommutator necks arranged to be connected to said bars after the latterare assembled, and means for locking said necks in place relatively tosaid bars and preventing the withdrawal of such means when once inplace.

7. In a commutator, a plurality of slotted commutator bars, a commutatorneck for each bar arranged to be inserted in the slot therein after thecommutator is assembled, and non-withdrawable locking means for holdingsaid necks in place relatively to said bars.

8. In a commutator, a plurality of slotted commutator bars, a pluralityof commutator necks adapted to be inserted in the slots of therespective commutator bars after the latter are assembled, and aplurality of snap keys fitting into said slots for locking said necks inplace relatively to their respective bars.

9. In a commutator, a plurality of slotted commutator bars, a pluralityof commutator necks arranged to beinserted in the slots of therespective commutator bars after the latter are assembled, a key forlocking each of said necks in place relatively to its bar, and means forpreventing the withdrawal of said key when once it is in place.

10. In combination, a commutator bar having a radial, longitudinal slot,a commutator neck adapted to be inserted into said slot, and a memberwhich, when inserted radially into said slot after said neck has beeninserted, locks said neck in place.

11. In a commutator, a plurality of com mutator bars, each having aradial, longitudinal slot, a plurality of commutator necks arranged tobe inserted radially in the slots in their respective bars after thecommutator has been assembled, and resilient means for locking saidnecks in place relatively to said bars.

In testimony whereof I afiix my signature in the presence of twowitnesses.

HOIVARD I-I. HAL STON.

Witnesses GEO. B. ScHLnY, FRED J. Kinsey.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

